Lock for dogging means of a bolt retractor



Nov. 26, 1957 Filed July 19 1951 Fig. I.

M. A. FRANK 2,814,196

LOCK FOR DOGGING MEANS OF A BOLT RETRACTOR z sheets-sheet 1 Milton A. Frank BY v ,4 W Aim INVENTOR.

Nov. 26, 1957 Filed July 19, 1951 2 Sheets-Sheet 2 Milton A. Frank INVENTOR.

United States 1 LUCK FOR DOGGING MEANS OF A BOLT RETRACTOR The invention described herein may be manufactured and used by or for the Government, for governmental purposes, without the payment to me of any royalty thereon.

My invention relates generally to looks and particularly to an improvement in those which include latching buttons which are accessible from the face plate of the lock casing. In locks of this type, the operation of the latch bolt is controlled by the latching buttons to the extent that in one of their positions, the latching but'to'ns permit the latch bolt to be withdrawn when the knob is turned, and in their other position the latch bolt is prevented from being withdrawn by merely turning the knob. A common problem with this type of lock is that the latching buttons are frequently interfered with by unauthorized persons with the result that the lock is unlatched or latched contrary to the desires of the person in charge of the area. which is closed by the lock.

it is an object of my invention to eliminate this common problem referred to above. I accomplish this object by providing a lock which includes structure for preventing any interference with the latching buttons by unauthorized persons.

It is an object of one form of my invention to prevent interference with the latching buttons of conventional locks by modifying them slightly. This form of my invention possesses the meritorious feature of not making all present locks obsolete.

It is an object of another form of my invention to provide a lock which is particularly adapted to be used for restricted areas. This arrangement includes structure which permits unlatching of the latching buttons only by the holder of a special key but which permits latching of the latching buttons by anyone. This feature is particularly useful in activities which employ watchmen who inspect all closures for unlatched locks. If a watchman finds a lock with this arrangement which has been unlatched, he can latch it immediately even if he does not have a special key. I

With the above objects and others as may subsequently appear, this invention resides in the parts and in the combination, construction and arrangement of parts, all as will be more fully described in the specification and which are illustrated by way of example in the accompanying drawings. Like reference numerals refer to like parts throughout the drawing, wherein: Fig. 1 is a side elevation of a conventional lock with the side plate broken away. Fig. 2 is a perspective view of one form of my invention showing the parts in their latched condition. Fig. 3 is a perspective view of the same device shown in Fig. 2, illustrated in its unlatched condition. Fig. 4 is a sectional view taken on line 44 01 Fig. 3 with some portions shown in elevation. Fig. 5 is a side elevation of a second form of my invention showing some parts in section.

Referring to the drawings, Fig. 1 illustrates a conventional lock which is shown in an unlatched condition. Conventional lock casing is provided with face plate atent 12 in which are located two latching buttons 14 and 16 respectively which project through openings in face plate 12 and into the interior of the lock casing. Upper button arm 18 and lower button arm 20 are operatively connected to latching buttons 14 and 16 respectively. Button arm lever 22 is pivotably mounted on pin 24, which is fixed to the back plate 11 of casing 10, and has one of its ends pivotably connected to upper button arm 18 by pin 26 and its other end pivotably connected to lower button arm 20 by pin 28. With this arrangement, the button arms are operatively connected by the button arm lever so that when one button arm moves in one direction, the other button arm moves in the opposite direction. The other elements in the conventional lock illustrated in Fig. 1 are the latch bolt 30 which is spring pressed to its normally projecting position by compression spring 32 which surrounds latch bolt shaft 31 and is positioned between collar 34 formed on the latch bolt and washer 35 which is positioned adjacent to guides 36 formed on the back plate 11 of casing 10. The end of latch b'o'lt shaft 31 has a collar 38 formed thereon which is operatively engaged by a portion of latch bolt retracting arm 40. Latch bolt retracting arm 40 has a curved upper portion 42, is pivotable on pin 44, and is urged to its normal position by leaf spring 46. Conventional lock 48 has a downwardly extending arm 50 which is adapted to engage the end of curved portion 42 and move the arm 40' against the pressure of the spring 46, thereby moving the latch bolt when the key is inserted in lock 48 and turned. Conventional knob hub 52 has an upwardly extending arm 53 which is adapted to engage latch bolt retracting arm 40 at approximately point 55 and move said arm 40, thereby retracting the latch bolt when the knob (not shown) which is operatively connected to knob hub 52 is turned. Knob hub 52 has a notch 54 formed therein which is adapted to receive the inner end 57 of lower button arm 20 when latching button 16 is pushed in.

From the above description of the conventional lock illustrated inFig. 1 it is apparent that when the latching buttons are in the unlatched position (shown in Fig. 1) the latch bolt may be withdrawn by: (1) turning the knob, or (2) inserting the key in the lock and turning it. When the latching buttons are adjusted to their latched position wherein the inner end 57 of the lower button arm 29 is positioned within the notch 54, it is apparent that the knob hub 52 cannot be turned and therefore the latch bolt can be retracted only by using the key in the lock 48. A major drawback of these conventional locks is that any one who has access to the faceplate of the lock can adjust the latching buttons. This is undesirable, for in many activities it is intended that the users of a closed area have ingress to the area only by using their keys to the lock and that the lock be latched most of the time. In many instances, these people have unlatched the lock and inadvertently left it in this condition.

With a view toward eliminating this shortcoming, in one form of my invention I have modified the conventional lock of Fig. l to the extent shown in Fig. 2. Lug 56 has been provided on the inner end of upper button arm 18 and a conventional cylinder cabinet lock 58 has been mounted in the lock casing above the upper button arm. The details of cabinet lock 58 are shown in Fig. 4. Cabinet lock 58 has a vertically slidable keeper 60 which is normally pressed to its lower extended position by spring 62 and which can be temporarily retracted by inserting a cabinet lock key into cabinet lock barrel 64 and turning it. Lock barrel 64 has an eccentrically mounted pin 66 on its inner end which is received in slot 68 of keeper 60 and cooperates therewith to retract the keeper when lock barrel 64 is turned. When the keeper is in its extended position, the latching buttons cannot be adjusted regardless of whether they are in their latched or unlatched position. Figure 2 shows the latching buttons in their latched position wherein latching button 16 is pushed in and the inner end 57 of lower button arm 20 is positioned in notch 54 of knob hub 52. In this position the lug 56 is positioned adjacent to the keeper 60 and is prevented from being moved inwardly by said keeper. When the latching buttons are in their unlatched position, shown in Fig. 3, the latching button 14 is pushed in and the upper button arm 18 is moved to its inner position, and lug 56 is positioned within notch 70 of keeper 60 and its movement prevented thereby. From the above description, it will be apparent that in this form of my invention, the latching buttons can be adjusted only by the holder of the key to the cabinet lock, for in order to adjust the latching buttons, it is necessary to first retract the keeper 60.

In a second form of my invention, I have provided a lock arrangement wherein the lock can be latched by anyone having access to the faceplate but which can be unlatched only by the holder of a secondary key. This arrangement has the advantage of permitting a watchman to latch the lock if he finds that it has inadvertently been left unlatched even if he does not have a secondary key.

This form of the invention is illustrated in Fig. wherein the locking structure is similar to that of the first form of my invention but the latching structure is unique. In Fig. 5, solid lines indicate the parts in unlatched condition and dotted lines indicate the parts in latched condition. The latching structure comprises a latch button 80 having a button arm 82 associated therewith. Button arm 82 is slidably guided in guides 84 and has a vertically extending arm 86 formed on its upper side and a notch 88 in its lower surface. Compression spring 90 is positioned between arm 86 and upper guide 84 and normally urges button arm 82 to the left to a position wherein its inner end 83 is clear of notch 54. A secondary lock 92, which is similar in construction to cabinet lock 58 of the first form of my invention is accessible from the faceplate and is positioned beneath the button arm 82. Secondary lock 92 includes a keeper 94 having projecting lug 96 formed on its upper surface. Keeper 94 is slidably mounted in the inner end of secondary lock 92 and is urged upwardly by compression spring 98. Secondary lock 92 also includes a conventional lock barrel 100 which has an eccentrically mounted pin 102 formed on one end which is received in slot 104 of keeper 94 and'cooperates therewith in the step of retracting said keeper. Keeper 94 can be retracted downwardly against the pressure of spring 98 by inserting a secondary key in lock barrel 100 of secondary lock 92 and turning it. When the secondary key is removed keeper 94 is again urged upwardly by compression spring 98.

The solid lines in Fig. 5 indicate the parts of the entire lock in their unlatched condition. In this condition, button arm 82 is urged to its out position by spring 90 and keeper 94 is urged upwardly by spring 98. Since lug 96 is not in register with notch 88, it merely presses against the lower side of button arm 82. To latch the main lock, button 80 is pushed inwardly and when the notch 88 reaches a point wherein it is in register with lug 96, keeper 94 moves upwardly and lug 96 enters notch 88 thereby dogging button arm 82 and preventing any further movement thereof. In this position, the inner end 83 of button arm 82 is positioned within notch 54 of knob hub 52, thereby dogging it and preventing rotation thereof. The dotted lines in Fig. 5 illustrate the entire lock in its latched position. In order to unlatch the main lock, it is'necessary to insert a secondary key in the secondary lock 92 and turn it thereby retracting keeper 94. When lug 96 clears notch 88, button arm 82 is moved to the left to its-out position by spring 90. In this position, the main lock is unlatched for the inner end 83 of button arm 82 is free of notch 54 of the knob hub 52. Since the notch 88 of the button arm 82 is not in register with lug 96 of the keeper 94, lug 96 merely presses against the lower side of button arm 82 when the secondary key is withdrawn.

From the above description, it will be apparent that in this form of the invention, any one having access to the faceplate can latch the main lock but only one having the secondary key to the secondary lock can unlatch the main lock.

Havingfully described my invention, I claim:

1. In a lock the combination comprising a casing, a face plate for said casing, a latch bolt, a latch bolt retracting member, a knob hub having a lug adapted to operatively engage said latch bolt retracting member, push button means in said face plate for dogging said knob huh, means comprising an independent key operated cylinder lock in said face plate positioned apart from said push button means, blocking means operated by said cylinder lock to positively engage and lock said push button means.

2. In a lock the combination comprising a casing, a face plate for said casing, a latch bolt, a latch bolt retracting member, a knob hub having a lug adapted to operatively engage said latch bolt retracting member, a plurality of push button means in said face plate for dogging and releasing said knob hub, means comprising an independent key operated cylinder lock in said face plate positioned apart from said push button means, blocking means inside said face plate operated by said cylinder lock to positively engage and lock said push button means.

3. The structure of claim 2 in which the blocking means is characterized by having a notch therein.

References Cited in the file of this patent UNITED STATES PATENTS 949,613 Berry Feb. 15, 1910 961,979 Mason June 21, 1910 693,591 Lawrence July 5, 1910 976,784 Curlett Nov. 22, 1910 1,062,176 Mason May 20, 1913 1,083,483 Deibert Jan. 6, 1914 1,167,529 Shaw Jan. 11, 1916 1,169,541 Hurd Ian. 25, 1916 1,512,986 Hurd Oct. 28, 1924 

